Clamping device for web-cutting machines



Feb. 4, 1930. H. w. ORNDOFF CLAMPING DEVICE FOR WEB CUTTING MACHINES 3Sheefs-Shet Filed Aug. 24, 1928 ML 766 a.

Feb. 4, 1930. H. w. ORNDOFF ,CLAMPING DEVICE FOR was cu'r'rme MACHINESFeb. 4, 1930. H. w. ORNDOFF 1,745,442

CLAMPING DEVICE FOR WEB CUTTING MACHINES Filed Aug. 24, 1928 3SheetsrSheet 3 Invenfar: jfferaerf Z0- Orndofi mah neshow ngth a rang et fithesup.

Patented Feb. 4, 1930 UNITED STATES, PATENT OFFICE HERBERT w, ORNJJOFF,OF NEW ORLEANS, LOUISIANA, Assre vonro THEE. v. BEN- JAMIN 00., me; orNEW ORLEANS, LOUISIANA, A oonronA'rron or LOUISIANA,

TRADING AS MAGINNIS corzron MILLS C A I CE FOR EB-C TING MACH ESApplication filed August 24, 1928. Serial No. 301,909.

This invention relates to" a clamping-device for employment in aweb-cutting 'IIlflClllIlB,

, :and is particularly adapted for employment in such machines whichutilize a continuous supply o-fweb'to the cutting mechanlsm.

It has been found in practice that for accuracy of out and for lowpower-demand upon the driving system, it is desirable that the cuttingblades should-operate successively across the'width of'the fabric, inorder to avoid the jerk in thedriving system which might occur I ,if theknife were designed to operate instantimed relationship with respect tothe opera- 1 ti'on of theknifeitselfa Guide meansare protaneouslyu forthe entire width, and also to gain the advantage of a progressive orscis- 'sors-like cut. When this is attempted with a continuoussupplyofweb material to thecut- 'ting device, -the cutting isapt tobe distortedaway from the true right angle across the'web.

' According to the present invention, means are provided for clampingthe webon itsway to' the .cuttingdevice, and'for its entire width, sothat the web is supported during the t me 'for-which-the knife operatesto sever a portion from this web.- The clamping device comprisesgripping members extending for thewidth of themac'hine and normallyoutof engagement'with the web, but adapted to be brought; to clam-pingrelationslnp therewith by means of a cam driven with the kmfemechanismso that the clamping occurs at proper videdfor delivering the web tojtheclamping members and for guiding it therefrom tothe knife edges proper.1

These and other features of: the invention are illustrated in teaccompanymg drawings, which Show: I VFigure 1 is an end view of a porton of a ply ng, utt ng and clampi g devi A t ken parall l o ig 1,owingther la t on h ip f hes ver lp t them m ltfifclamping .an vcut ing-F 1g, 2 -is a seotiona-lview on a largerscale,

Fig. 3 is a similar view leasing p s on for he the Web prior to a newcutting.

vFig. 4 is a top plan view of one side of the machine.

In these drawings, the machine has a fixed table plate with an upwardlyextending standard 15 thereon providing a bearing for the shaft of themeasuring drum 21. The standard 15 also hasa bearing for the cuttingshaft 22. Brackets 23 carry a fixed knife 24.

Arms 25 rigidly supportedon thestandard 15 are provided withpivots 26 topivotally support a swinging plate 27 which extends for the full widthof the web, and has an angularly bent bottom edge 28. This plateisstiffened at its lower end by an angle iron 29 riveted thereto. At thelower edge of the plate and angle iron are roller brackets 30 to supportthe pivot pins 31 for the rollers 32. One roller is provided ateach sideof the machine, beyond thedrum and knife, for cam actuation as will bedescribed more closely hereinafter.

The standard l5 likewise carries an angle bracket 33 having'a support 34thereon for a rubber cushion pad 35 which likewise extends for thewidthof the web and is located opposite the angle at the lower end ofthe swinging plate 27 for cooperation therewith to clamp the web, andsubstantially vertically above the edge of the stationary knife 24. Thesupport 34; also carries a guide plate 36 which removes the web from themeasuring drum 21 and guides it down between the swinging plate 27 andthe rubber pad 35. After the web has passed between the gripping members28, 35 when the latter are open,

it encounters a second guide plate 37 formed of thin resilient materialwhich delivers it to the edge of the stationary cutting knife 24, from'which it passes onto the continuously moving tape 38 passing over theguide roller 39, being carried by the continuous movement of this tapetowardthe left, insuccession as it is fed by the measuring drum 21.

' The continuouslyrotatingcutting shaft 22 carries a clamp member 40 towhich the re volving knife 41 is fastened in a customary manner by capscrews 42, so that the knife will cooperate with the stationary knife 24to shear the material with a scissors-like action by reason of theslightly helical shape of the revolving knife.

Y in? The cutting shaft 22 furthercarries at each end a cam member 43having a hump 44 to cooperate with a swinging roller 32 at the moment ofcutting. The arms 25 are provided with spring holders 45 to support oneend each of return springs 46 which at their other ends are connected tothe swinging .shaft and the sprocket 51 on the measuring drum shaft areconnected by a chain .52 so that the two members move at a definitespeed relationship and with definite angular movements with respect toone another. They are continuously drlven from any suitable source ofpower by a chain drive 53 (Fig. 4) which drives a sprocket 54 on thecutting shaft 22. I As the measuring drum moves, it receives a web offabric and'passes itdownward between the gripping devices comprising theangle on the swinging plate 27 and the rubber pad 35, past thestationary knife 24 and onto thedelivery tape 38. F or the time be ing,the swinging plate 27 is held away from any gripping action by itsreturn spring 46, and the guides 36 and 37 cooperate to deliver thesheet in regular manner to the delivery tapes 38. It is preferred thatthe resilient guide plate 37 should be held very close to the edge ofthe stationary knife 24, and it may be formed of soft brass andpermitted to: pass beyond the edge of knife 24 a short distance toassure that the material shall not remain hanging or supported onthestationaryknife 24. I The rotating knife 41 represses the resil ientplate .37 without damage to itself or. the plate. r During thisdelivery, the cutting shaft 22 has been rotatedwith the measuring drumshaft 20, until finally the rotatingknife 41' comes into shearingrelationship with. the stationary knife '24 and shears off the web ofmaterial for its entire width. A very short;

time prior to the beginning. of this shearing operation, the rise orhump 44 of the'cam 43 has encountered the swinging roller 42 and hasforced this roller and therewith the of the web of material past thestationary.-

knife 24. The shearing is accomplishechand immediately following this,the hump 24 passes from opposite the swinging roller 32 and permits thelatter and the swinging plate 34 to be returned in a clockwise directionby the spring 46, so that the web of material. is again free to movedownward past the stationary knife 24 and onto the delivering table 38.Meanwhile, the delivering tapes have carried along the blank or sheetwhich has just been cutoff.

.The clamping operation .of the gripping members, as just described,causes a momen- V tary stoppage of the end of theweb of material, sothat the measuring drum will'cause a small accumulation of material inthe an-, gle between the swingingjplate 27 the guide plate 36 and thedrum itself; but such accumulation is easily taken care of in the Space,I It may be pointed out that in a machine already constructed theangular displacement aboutthe cutting shaft of the two ends of the Ihelicalcutting edge is about five-eighths of an inch for a knife lengthof fifty inches. In other words, the length of they hump 44 0f cam 43 isdesigned to be slightly greater than five-eighths of an inch inperipheral angular distance. I

Itis obvious that the invention is not limited to the illustrativeexample shown and described, but that it may be applied in many 2ways'within the scope of the appended claims.

What I claim as newand desire to secure by Letters Patent is 1 1. Inadevice of the class disclosed, a drum, acutter to sever. a web'ofmaterial coming from said drum, means-to continuously drive said drumandcutter, an'd means synchronized with thecutter to clamp the webduring thetime of cutting-while permitting the continuous feeding of theweb bysaid drum.'

2; In a device'of the class described, a feed ing drum, a cutter tosever a web ofmaterial coming from said drum, means to continuouslydrive said drum and cutter, fixed guide means to deliver the materialfrom said drum to said cutter, a swinging plate to cooperate with saidfixed. guide means, means to hold said swinging plate and said fixedguide means, normally separated, and means syn-. chronized with thecutter to move the plate toward said fixed guid-e whereby to clamp I tofeeda web of fabric, a guide delivering the web from said drum, astationary knife mounted wlth its cutting edge substantially beneath theend of the delivery "guide, a rotating knife to cooperate withsaidstationary.

knife, driving means to: continuously .oper: ate said drum and rotatingknife, and means synchronized with said rotating knife to clamp the webof fabric'during thetime of cutting, said clamping occurringsubstane'dge. r

a 4. In a deviceof the class described, a drum to feed a web of fabric,fixed guide meansto tially vertically above the stationary knife 7deliver the web from the drum, a stationary from said fixed guide means,and a stop to knife opposite the end of said guide means, limit themovement of said plate away from a rotating knife to cooperate with saidstasald fixed guide means.

tionary knife, means to drive said rotating 5 knife and drumcontinuously, a fixed clamping plate located in said guide, and meanssynchronized with said rotating knife to clamp the web during thetime'ofcutting,

said guide means including a resilient guide member to deliver the freshcut edge of the web after cutting from said clamp past sald stationaryknife.

5. In a device of the class described, a

drum to feed a web of fabric, a frame to support said drum for rotation,a bracket fixed c on said frame, a fixed guide on said bracket todeliver the web from said drum, a rubber pad fixed on said bracket, aswinging plate pivoted on said frame, said plate having a rebent lowerend presenting an angle for cooperation with said pad to clamp the webof fabric, cutting means to sever the web of fabric locatedsubstantially beneath said pad, means to drive said drum and cuttingmeans continuously, and means synchronized with 7 said cutting means tooperate said plate to clamp the web during the time of cutting.

6. In a device of the class described, a drum to feed a Web of fabric, arotating shaft having a cutter thereon, means to drive said drum andcutter continuously, clamping means to clamp the web of fabric betweensaid drum and cutter, a stationary cutter to cooperate with saidrotating cutter, a cam on said shaft, 5 and means cooperating with saidcam whereby said cam and means actuate said swinging plate to clamp thefabric during the time of 7 cutting.

7. In a device of the class described, a drum to feed a web of fabric,cutting means including rotating and stationary knives, fixed guidemeans ,to deliver the web from said drum to said knives, and a movingplate to cooperate with said guide to clamp the fabric between said drumand cutting means, means to drive said drum and rotating knifecontinuously, and means synchronized with the rotating knife to clampthe web during the time of cutting, said guide and plate forming acollector forv the material fed by the drum during such clamping.

8. In a device of the class described, a

drum to feed a web of fabric, a frame in which said drum is journaled,fixed guide means on said frame to deliver the fabric from the drum, aplate pivoted on said frame p and adapted to be swung toward said fixedguide means whereby to clamp the web of 6Q fabric, cutting meansincluding rotating and fixed knives, means to drive said drum androtating knife continuously, means connected to said rotating knife toactuate said plate to clamp the web during the time of cutting, means tonormally hold said plate separated In testimony whereof, I affix mysignature.

HERBERT w. oRNDoFF.

